Nature of problem:Expressions obtained in the calculation of one-loop radiative
corrections in particle physics are generally simplified by expressing
them in terms of scalar integrals. LERG-I reduces the form factors,
associated with the various possible Lorentz tensors, occurring in the
problem, to scalar integrals.

Solution method:The program makes use of identities that, in the context of dimensional
regularization, relate form factors to one and other in a heirarchical
fashion. The end result is that all form factors are finally defined
in terms of scalar integrals.

Restrictions:Processes with up to four external particles can be treated. Machine
storage is usually the only limitation.

Running time:Depends heavily on the complexity of the problem. The examples provided
as test runs took roughly 0.2 CPUs to execute.